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Product

wind turbine drip-loop, tray & pitch control cable UL 2277 WTTC / UL 1277 TC-ER1,000 V WTTC / 600 V TC-ER (-40 to +Cold & Oil-Resistant Torsion PVC Jac

UL Type WTTC 1,000 V / UL 1277 TC-ER 600 V Class K Unshielded Torsion Wind Turbine Tray CableUL 2277 WTTC / UL 1277 TC-ER — 1,000 V WTTC / 600 V TC-ER — -40 to +90 °C Wind Turbine Cable

UL Type WTTC 1,000 V / UL 1277 TC-ER 600 V Class K Unshielded Torsion Wind Turbine Tray Cable (UL 2277 WTTC / UL 1277 TC-ER) engineered for 1,000 V WTTC / 600 V TC-ER wind turbine service across -40 to +90 °C (min. bend radius 6 × OD).

Anti-torsion braid

Flame-retardant

Oil-resistant

Approved

Configuration

Order designation: UL WTTC 1000V Unshielded Tray 7G1.5 mm²
Outer Ø ≈: 11.4 mm
Net weight ≈: 215 kg/km
Max. pulling ≈: 2.4 kN
Core / stranding: IEC 60228 Class 5/6 / Class K Cu

All sizes (3)

Request a quote Datasheet WhatsApp info@tebaoflex.com

Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum

Rated voltage: 1,000 V WTTC / 6
Operating temp.: −40…+90 °C
Min. bend radius: 6 × OD
Core / conductor: Class K (30 AWG)
Outer protection: Cold & Oil-Resis
Standard: UL 2277 WTTC / U

Typical values for this cable type, based on UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification — confirmed in the datasheet and quotation for your order.

Application fit

Is UL WTTC 1000V Unshielded Tray right for your machine?

Free-hanging vertical run

Suitable

Class 5, Class 6 and Class K extra-flexible copper cores withstand continuous ±150°/m drip-loop and ±450°/0.5m pitch torsion down to −40/−

Fixed installation

Suitable

UL 2277 WTTC 1,000 V / UL 1277 TC-ER 600 V and IEC 0.6/1 kV ratings allow open tray and Exposed Run routing across the nacelle and tower.

Switchgear & control cabinet wiring

Suitable

Number-coded cores and 85% tinned copper braid / foil+braid shields terminate neatly into pitch servo boxes, slip-rings and PLC cabinets.

Energy chain / drag chain

Suitable

PUR-sheathed Class 6 pitch & slip-ring cables (RT 113/123, RT 114/116) handle combined rotary hub motion and bending.

Vertical / spreader reel

Not suitable

Wind turbine control and tray cable is not engineered for deepwater vertical oceanographic lift winches.

Use A304739 BOP MUX Umbilical

Typical machinesRenewable Energy & EV ChargingWind Turbine Rotor Hub Pitch Control & Slip-RingsNacelle-to-Tower Multi-Core Drip-Loop Control BundlesUL 2277 WTTC / TC-ER Nacelle & Tower Cable TraysBlade De-Icing, Trace Heating & Aviation Obstruction Lights

Construction

Layer by layer

Shown: UL WTTC 1000V Unshielded Tray (UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification) featuring class k (30 awg) bare copper conductors (3–12 cores), pvc / nylon (thhn/thwn) core insulation and cold & oil-resistant torsion pvc jacket (-40 °c) (3-layer construction).

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Class K (30 AWG) Bare Copper Conductors	Extra-flexible rope-stranded plain copper (14 AWG to 10 AWG)
2	PVC / Nylon (THHN/THWN) Core Insulation	1,000 V WTTC & 600 V TC-ER numbered core insulation
3	Cold & Oil-Resistant Torsion PVC Jacket	Exposed-Run (ER) rated jacket for nacelle trays & drip loops

UL WTTC 1000V Unshielded Tray — Standard Wind Turbine Execution

Built to UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification with class k (30 awg) bare copper conductors (3–12 cores) and cold & oil-resistant torsion pvc jacket (-40 °c)

UL WTTC 1000V Unshielded Tray — Pre-Cut Tower / Drip-Loop Kit

Available on bulk export reels or pre-cut to turbine tower section and nacelle drip-loop lengths

UL WTTC 1000V Unshielded Tray — Cold Torsion & Routine Certified

Supplied with EN 10204 3.1 routine dielectric, conductor DC resistance & cold-torsion qualification report

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage / operating system: 1,000 V WTTC / 600 V TC-ER (UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification)
Core / conductor construction: Class K (30 AWG) Bare Copper Conductors (3–12 Cores) — Extra-flexible rope-stranded plain copper (14 AWG to 10 AWG)
Primary dielectric / insulation: PVC / Nylon (THHN/THWN) Core Insulation — 1,000 V WTTC & 600 V TC-ER numbered core insulation

Thermal

Continuous operating temperature: −40…+90 °C (wind turbine nacelle, hub & tower duty)
Low-temperature torsion & cold bend: Verified cold-flex and torsion endurance across −40…+90 °C per UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification
Storage & transport temperature: −40…+80 °C on export wooden/steel cable drum

Mechanical

Outer jacket / sheath protection: Cold & Oil-Resistant Torsion PVC Jacket (-40 °C) — Exposed-Run (ER) rated jacket for nacelle trays & drip loops
Minimum bending radius: 6 × OD
Intermediate screen / separator / core layer: PVC / Nylon (THHN/THWN) Core Insulation — 1,000 V WTTC & 600 V TC-ER numbered core insulation

Resistance

Oil, grease, ozone & UV resistance: Resistant to wind turbine gearbox oil, hydraulic fluid, ozone and UV weathering per UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification
Flame retardancy & smoke/halogen emission: Flame-retardant and environmental performance verified per UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification
RoHS & REACH compliance: RoHS 2 (2011/65/EU + 2015/863) & REACH SVHC compliant

Reference standards

Governing standard: UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification
Conductor & flame/test standards: IEC 60228 / IEC 60332-1-2 & -3 / UL 2277 WTTC / EN 10204
Quality management & inspection: ISO 9001:2015 & EN 10204 3.1 factory routine inspection

Identification

Model designation: UL WTTC 1000V Unshielded Tray
Sheath colour & metre marking: Continuous metre-marked black outer finish (Cold & Oil-Resis)
Customs tariff (HS): 8544.49 / 8544.60

Sizes

3 standard UL WTTC 1000V Unshielded Tray wind turbine configurations

Manufactured to UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification for wind turbine yaw drip-loop, pitch control, tower power and converter applications.

Dimensions, tensile load & weights
Order designation	Configuration	Core / stranding	Outer Ø ≈ mm	Net weight ≈ kg/km	Max. pulling kN ≈	Min. bend R mm
UL WTTC 1000V Unshielded Tray Construction Schedule (−40…+90 °C)
UL WTTC 1000V Unshielded Tray 7G1.5 mm²	7G1.5 mm² (or 7C × 16 AWG)	IEC 60228 Class 5/6 / Class K Cu	11.4	215	2.4	70
UL WTTC 1000V Unshielded Tray 12G1.5 mm²	12G1.5 mm² (or 12C × 16 AWG)	IEC 60228 Class 5/6 / Class K Cu	14.8	345	4.1	90
UL WTTC 1000V Unshielded Tray 18G2.5 mm²	18G2.5 mm² (or 18C × 14 AWG)	IEC 60228 Class 5/6 / Class K Cu	19.6	680	9.8	120

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Custom conductor cross-sections, core counts, pre-lugged tower kits and drum lengths available per UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification.

Electrical & thermal parameters
Configuration	Max. DC R₂₀ Ω/km	Rating / Impedance	Operating temp.
7G1.5 mm² (or 7C × 16 AWG)	13.30	1,000 V WTTC / 600 V TC-ER (18 A)	−40…+90 °C
12G1.5 mm² (or 12C × 16 AWG)	13.30	1,000 V WTTC / 600 V TC-ER (16 A)	−40…+90 °C
18G2.5 mm² (or 18C × 14 AWG)	7.98	1,000 V WTTC / 600 V TC-ER (24 A)	−40…+90 °C

Every production length undergoes routine conductor DC resistance, AC high-voltage spark/dielectric and dimensional verification.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

ConductorClass 5 stranding
Spark test100 % in-line
Lay-upCores, earth, fillers
SheathingInner, braid / screen, outer
Electrical testsAC voltage, resistance
DimensionsOD, wall thickness
Inspection documents & dispatchDrum & dispatch

Testing & inspection	Test value / reference	Frequency
Routine tests
Conductor DC resistance & dimensional verification (UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification)	DC resistance at 20 °C and insulation/sheath wall thickness within UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification limits	Every manufactured drum length
AC high-voltage dielectric & insulation resistance test (UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification)	Zero dielectric breakdown and verified insulation resistance for 1,000 V WTTC / 600 V TC-ER rating	Every manufactured drum length
Sample tests
Low-temperature drip-loop torsion, oil & flame qualification (UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification)	Verified cold torsion cycle endurance, oil resistance and flame retardancy across −40…+90 °C	Type qualification & periodic lot audit

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

UL 2277 WTTC / UL 1277 TC-ER CompliantEN 10204 3.1 Factory Test CertificateCE, RoHS 2 (2011/65/EU) & REACH

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX UL WTTC 1000V Unshielded Tray UL 2277 WTTC / UL 1277 TC-ER 1,000 V WTTC / 600 V TC-ER CE

Delivery form: Heavy-duty export fumigated wooden drums, steel reels or pre-cut wind turbine tower & drip-loop kits
Standard lengths: 500 m, 1,000 m or custom cut-to-length nacelle drip-loop and tower section sets
MOQ: 100 m (standard configurations) · 300 m (custom wind builds)
Lead time: 2–4 weeks ex-works
Incoterms: EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFUL Type WTTC 1,000 V / UL 1277 TC-ER 600 V Class K Unshielded Torsion Wind Turbine Tray Cable – technical datasheet3 configurations · 3-layer construction, technical data, approvals XLSXUL WTTC 1000V Unshielded Tray spec data (Excel)All 3 configurations with dimensions and ratings, for your BOM or quotation

Revision: 2026-10-27
Updated: 2026-10-27

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

What governing standard and construction define UL WTTC 1000V Unshielded Tray (UL Type WTTC 1,000 V / UL 1277 TC-ER 600 V Class K Unshielded Torsion Wind Turbine Tray Cable)?

UL WTTC 1000V Unshielded Tray (UL Type WTTC 1,000 V / UL 1277 TC-ER 600 V Class K Unshielded Torsion Wind Turbine Tray Cable) is manufactured in accordance with UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification for 1,000 V WTTC / 600 V TC-ER wind turbine service over -40 to +90 °C. Its 3-layer construction comprises class k (30 awg) bare copper conductors (3–12 cores), pvc / nylon (thhn/thwn) core insulation and cold & oil-resistant torsion pvc jacket (-40 °c).

What is the minimum bending radius and operating temperature range for UL WTTC 1000V Unshielded Tray?

The minimum bending radius for UL WTTC 1000V Unshielded Tray is 6 × OD across its continuous operating temperature range of -40 to +90 °C, ensuring mechanical torsion resistance and dielectric reliability in wind turbine nacelles, hubs and towers.

How are the concentric layers of UL WTTC 1000V Unshielded Tray arranged from inside to outside?

From inside to outside, the construction sequence is: (01) Class K (30 AWG) Bare Copper Conductors (3–12 Cores) — Extra-flexible rope-stranded plain copper (14 AWG to 10 AWG); (02) PVC / Nylon (THHN/THWN) Core Insulation — 1,000 V WTTC & 600 V TC-ER numbered core insulation; (03) Cold & Oil-Resistant Torsion PVC Jacket (-40 °C) — Exposed-Run (ER) rated jacket for nacelle trays & drip loops.

What factory test certificates are supplied with UL WTTC 1000V Unshielded Tray?

Every production drum of UL WTTC 1000V Unshielded Tray undergoes routine conductor DC resistance, AC high-voltage dielectric and dimensional testing per UL Subject 2277 Type WTTC 1,000 V & UL 1277 TC-ER 600 V Class K Tray Specification, and is delivered with an EN 10204 3.1 factory test certificate.

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01Selected sizes

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02Reel & motion

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Reel typeDrum core diameter (mm)Cable length on drum (m)Travel speed (m/min)Max. accelerationCycles per hourLength and quantityAmbient temperatureExposure (outdoor, water, oil, abrasion)Destination countryEquipment and operating conditions

03Message for our engineers

UL WTTC 1000V Unshielded Tray UL Type WTTC 1,000 V / UL 1277 TC-ER 600 V Class K Unshielded Torsion Wind Turbine Tray Cable

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Reel & motion:
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